"At present, although the LED market has entered an accelerated integration period, the industry products are still showing that middle and high-end LEDs are scarce, while the low-end and mid-range are everywhere and the price is still going down. In terms of corporate strategy, more and more enterprises are on the market. Start vertical integration, and continue to extend the existing advantages to enhance market competitiveness.†Liang Fubo, vice president of Jingneng Optoelectronics, told the author during the Guangya exhibition.
As the world's first company to realize the industrialization of silicon substrate LED, Jingneng has been walking in a low-key manner in the industry, and the first prize of the National Technology Invention Award at the beginning of this year has made Crystal Energy famous. Following the planning of Jiangxi Province to build Nanchang Optical Valley and build a 100 billion LED industry, followed by the launch of Crystal Energy's global silicon substrate LED business partner program, behind a series of events, it seems that crystal energy to the industry Declaration: The opportunity window for crystal energy has arrived!
Silicon substrate is produced by vertical structure LED
"It can be said that the silicon substrate is born for vertical structure LEDs." Liang Fubo said.
Why is the silicon substrate born for vertical structure LEDs? This starts with the vertical structure LED itself. At present, most of the small and medium power chips are sapphire LED chips, the P electrode and the N electrode substrate are on the same side (Fig. 1); and the vertical structure is the P electrode and the N electrode on both sides of the substrate (Fig. 2). At present, the vertical structure LED of sapphire is a structure in which a sapphire substrate is stripped, a highly reflective material is plated on the bottom of the chip, and a conductive and thermally conductive substrate material is added. Therefore, once a sapphire substrate is used, laser stripping is necessary, which results in low yield and high cost, and the high temperature during peeling may damage the LED epitaxial material.
However, the use of silicon substrates is completely different. Not only when the substrate is grown, the cost of the substrate is much lower than that of the sapphire material, but also the chemical etching method can be used to strip the substrate. The efficiency, yield and reliability are much higher than necessary. A sapphire substrate using a laser lift-off method. Because the silicon substrate is stripped off, the LED light-emitting surface is directly N-surface, that is, single-sided light-emitting, and the vertical LED beam of the silicon substrate is concentrated and the directivity is good compared with the light-emitting of the five-sided LED of the front-mounted LED.
What is more worth mentioning is that the silicon substrate can improve the luminous flux per unit area and the color uniformity of the chip surface in the actual manufacturing process of combining the white light chip, which provides the possibility of high quality lighting. At the same time, the ceramic packaging process can improve the reliability of the product.
Silicon substrate LED products are positioned in the high-end market
Liang Fubo said that the silicon substrate LED is the core competitive advantage of crystal energy. The strategy uses silicon products to hit the high-end market and replace foreign imports.
At present, crystalline silicon substrate LEDs are roughly classified into blue vertical LEDs and ultraviolet vertical LED series.
Blu-ray vertical LEDs are aimed at emerging high-margin markets such as automotive lighting and mobile phone flash. These areas require high-power vertical LEDs, which is the core advantage of Jingneng Optoelectronics. Among them, in terms of automotive lighting, Crystal Energy's efforts from the second half of 2015 to the current shipment of car headlights and strip lights have enabled Crystal to stand on the heels of the car headlight market. It is expected that this market will be In the third quarter of this year, a big breakthrough was ushered in.
In the mobile phone flash market, Jingneng is currently the largest domestic shipment company. From small batches in 2015 to the first half of this year, the products have been used in ZTE, Huawei, BBK, Xiaomi, Hammer, VIVO and other domestic high-end mobile phone brands. . Liang Fubo introduced: "We have a very professional mobile phone flash R & D team, spent a lot of time in the early stage to communicate with mobile phone manufacturers, design, through the audit, and now the order volume began to explode."
In terms of UV LEDs, it is understood that crystal energy has been laid out very early. As early as 2015, 380-410nm high-efficiency UVALED products were introduced, mainly for industrial curing. Industrial curing generally requires high-power LEDs, which is in line with the technical advantages of Crystal Energy. Liang Fubo said: "Since the first half of this year, the UV market is in a rising state. As one of the key development directions of Jingneng Optoelectronics, it will continue to expand into the market of sterilization and disinfection. It is expected that the proportion of UV vertical chips will reach 30%. -50%."
Liang Fubo confidently said: "Crystal's silicon-based LED products have matured. We are working hard to have an advantageous market segment. We are doing the best in these markets and dancing with our masters. We are very confident."
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